Y6

Maths

Angles in a Triangle (One Unknown Angle) Reasoning and Problem Solving

Worksheet
An image of the Angles in a Triangle (One Unknown Angle) Reasoning and Problem Solving Resource


Deepen understanding of how to calculate the value of one unknown angle in a triangle by using this resource.

This Year 6 Angles in a Triangle (One Unknown Angle) Reasoning and Problem Solving worksheet helps children use the knowledge that all angles in a triangle add to 180 degrees to calculate the value of one missing angle. Children will investigate why a particular triangle's missing angle means it shouldn't belong in a group, find possible missing angles that satisfy a problem and explain whether a child has reasoned using angles linked to triangles correctly. All answers are also included so that marking is as easy as possible!

A varied fluency resource and fluency matrix are also available for this small step.


Curriculum Objectives

  • Find unknown angles in any triangles, quadrilaterals, and regular polygons